A new species of Acesta H. & A. Adams, 1858, is described from offshore southeast of Nhatrang City, Khánh Hòa, Central Vietnam, and compared to four other species of this genus. It is characterized by the least oblique shape, a rather long dorsal margin and very thick edges of the byssal gape. Some notes on Acesta marissinica and A. philippinensis are added.